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  • 1
    Electronic Resource
    Electronic Resource
    Zweifache Borylierung von Benzolderivaten mit (Diisoalkylamino)boradiyl-Einheiten (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2461-2461 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241116
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of the deoxytetranucleotide d-pApTpApT and a sequence-dependent model for poly(dA-dT)Supplementary material on observed and calculated structure factors for d-pApTpApT is available from the authors. (1982)
    New York : Wiley-Blackwell
    Biopolymers 21 (1982), S. 513-533 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The x-ray structure of the hydrated ammonium salt of the deoxytetranucleotide d-pApTpApT was determined by Patterson and direct methods at a resolution of 1 Å. The crystal structure contains right-handed double-helical segments formed by complementary Watson-Crick-type hydrogen bonding between the adenine and thymine bases of neighboring molecules. The minihelix contains two base pairs. The chains are antiparallel. The A-T and T-A sequences have different phosphodiester conformations. The deoxyribose-pucker and the sugar-base orientation alternate along the chain depending on the nature of the base (3′-endo for purine and 2′-endo for pyrimidine). The extended structure is stabilized by base-base, base-sugar, and hydrogen-bond interactions. The minihelix of two base pairs provides starting coordinates for model-building studies of the dA-dT polymer. A B-DNA-type polymer structure is described, which has sequence-dependent alternations of both the deoxyribose pucker and the phosphate diester bridge conformation. Such sequence-dependent DNA structures, if present locally in regions such as operator sequences, could facilitate sequence-specific interactions. The crystal study also suggests possible geometrical parameters for the replication fork.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360210304
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesen, Halogenaustausch-Reaktionen und Kristallstrukturen funktioneller Silylamine - M = Si, Ge, Sn; Hal = Cl, Br - (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 582 (1990), S. 151-161 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses, Halogeno-Exchange Reactions, and Crystal Structures of Functional SilylaminesLithium compounds of aminofluorosilanes (1-7) react with MHal4 (M = Si, Ge, Sn; Hal = Cl, Br) to give compounds of the type (8-10, 12, 14: M = Si, 13, 15, 16: M = Ge, 17: M = Sn). 11, 12, 14, R2SiHalSiHal2F (11, 12: Hal = Cl, 14. Hal = Br), are obtained by an intermolecular halogeno exchange. The halogeno exchange depends on the substituents and is only observed by halogenated disilazanes with the substituents R = alkyl and aryl. The crystal structures of 8 and 12 were determined.
    Notes: Die Lithiumverbindungen der Aminofluorsilane (1-7) reagieren mit MHal4 (M = Si, Ge, Sn; Hal = Cl, Br) zu Verbindungen des Typs (8-10, 12, 14: M = Si, 13, 15, 16: M = Ge, 17: M = Sn). Unter intermolekularem Halogenaustausch werden 11, 12 und 14 erhalten, R2SiHalSiHal2F (11, 12: Hal = Cl, 14: Hal = Br). Der Halogenaustausch ist substituentenabhängig und wird nur an halogenierten Disilazanen mit den Substituenten R = Alkyl und Aryl beobachtet. Von 8 und 12 wurde eine Kristallstrukturanalyse durchgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905820119
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  • 4
    Electronic Resource
    Electronic Resource
    Fluorsilyl- und Fluorboryl-substituierte Cyclotetrasilazane Synthese und Kristallstrukturen (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 584 (1990), S. 87-104 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fluorosilyl and Fluoroboryl Substituted Cyclotetrasilazanes. Synthesis and Crystal StructuresMono- and dilithiated octamethylcyclotetrasilazanes (1, 6) react with fluorosilanes and F2BN(SiMe3)2, respectively, under retention of the cyclotetrasilazane structure yielding the mono- and disubstituted compounds 2-5 and 7-13. In the reaction of the dilithium compound 6 with a fluorsilane in equivalent amounts, the bicyclic compounds 14 and 15 are obtained. Crystallographic investigations of the compounds 2, 3, 8, and 9 indicate that the monosilylated eight-membered ring has a cradle conformation while the disilylated ring has a chair conformation. The X-ray structure of the bicyclic system 14 indicates that the nitrogen atoms of the Si3N-units have a pyramidal environment.
    Notes: Mono- und dilithiiertes Octamethylcyclotetrasilazan (1, 6) reagieren mit Fluorsilanen bzw. F2BN(SiMe3)2 unter Erhalt des Cyclotetrasilazangerüstes zu den mono- und disubstituierten Verbindungen 2-5 und 7-13. Bei der Umsetzung des Dilithiumsalzes (6) mit einem Fluorsilan im Molverhältnis von 1:1 werden die Bicyclen 14 und 15 erhalten. Kristallographische Untersuchungen von 2, 3, 8 und 9 zeigen, daß der monosilylierte Achtring in einer Wannen-, der disilylierte Achtring in einer Sesselkonformation vorliegt. In der Kristallstruktur des Bicyclus 14 zeigen die Stickstoffatome der Si3N-Einheiten eine pyramidale Umgebung.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905840107
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  • 5
    Electronic Resource
    Electronic Resource
    Supermesityl-stabilisierte Iminoborane (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 608 (1992), S. 147-152 
    Details
    ISSN: 0044-2313
    Keywords: 2,4,6-Tri-t-butylphenyl-substituted amino-imino boranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Supermesityl stabilized IminoboranesAmino-iminoboranes R′(SiMe3)N-B≡N-R: IIc (R′ = CHMe2), IId (R′= CMe3) and IIe (R′ = SiMe3) carrying the supermesityl group (R) on the imino nitrogen atoms have been prepared from the corresponding fluorobis(amino)boranes Ic-e by HF-elimination using t-BuLi (IIc, d) or n-lithio-bis(trimethylsilyl)amid (IIe). The Amino-iminoboranes are thermally stable at room temperature. Upon treatment of the fluorobis(amino)boranes Ia, Ib, Ie with t-BuLi, LiF and HN(SiMe3)R′ are eliminated and the B-t-butyl substituted iminoborane III is formed. The compounds are characterized by elementar analyses and spectroscopic data (MS, IR, NMR). An X-ray diffraction study has been performed for II d.
    Notes: Amino-imino-borane R′(SiMe3)N-B≡N-R:IIc (R′ = CHMe2), IId (R′= CMe3) und IIe (R′ = SiMe3) mit R = 2,4,6-Tri-t-butylphenyl- wurden aus den entsprechenden Fluorbis(amino)boranen Ic-e durch HF-Eliminierung mit t-Butyllithium (IIc, IId) bzw. Lithiumbis(trimethylislyl)amid (IIe) erhalten. IIc-e sind thermisch stabil und bei Raumtemperatur unbegrenzt haltbar. Die Umsetzungen der Fluorbis(amino)borane Ia (R′ = Me), Ib(R′ = CH2Me) und Ie (R′ = SiMe3) mit t- Butyllithium führen zur Abspaltung von LiF und HN(SiMe3)R′, wobei sich in allen Fällen des B-t-butyl-substituierte Iminoboran III bildet. Die Verbindungen sind elementaranalytisch und spektroskopisch (MS, IR, NMR) charakterisiert. Eine Röntgenstrukturanalyse wurde von IId durchgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926080222
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  • 6
    Electronic Resource
    Electronic Resource
    Reaktionen von (η2-Ethen)bis(triphenylphosphan)-platin(0) mit dimerem Hexafluorthioaceton Darstellung und Struktur von Platinacyclopentan- und -cyclopropanderivaten (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 542 (1986), S. 46-52 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of (η2-Ethene)bis(triphenylphosphane)platinum(0) with Dimeric Hexafluorothioacetone. Preparation and Structure of Platina Cyclopentane and Cyclopropane DerivativesThe five-membered (CS)2Pt ring 1 was obtained by the reaction of 2, 2, 4, 4-tetrakis(trifluoromethyl)-1,3-dithietane and (η2-ethene)bis(triphenylphosphane)platinum(0) at low temperatures. 1 is converted at its melting point to the three-membered CSPt ring derivative 2, with elimination of one molecule of hexafluorothioacetone. 2 is also formed directly when the reaction is conducted at temperatures above +30°C. 2 was characterized by an X-ray Structural analysis.
    Notes: Der fünfgliedrige (CS)2Pt-Cyclus 1 kann aus 2, 2, 4, 4-Tetrakis(trifluormethyl)-1,3-dithietan und (η2-Ethen)bis(triphenylphosphan)-platin(0) bei tiefer Temperatur erhalten werden. 1 wandelt sich an seinem Schmelzpunkt unter Abspaltung eines Moleküls Hexafluorthioaceton in den um zwei Ringglieder reduzierten CSPt-Ring 2 um, der auch auf direktem Wege durch Umsetzen des Dithietans bei Temperaturen oberhalb von +30° zugänglich ist. 2 konnte erstmals durch eine Kristallstrukturbestimmung charakterisiert werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865421108
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  • 7
    Electronic Resource
    Electronic Resource
    Umsetzung von Metall- und Metalloidverbindungen mit mehrfunktionellen Molekülen. XLI. Synthese von 9-Bora-10-oxa-phenanthrenen, Bis(2′-oxy-terphenylyl)halogenoboranen und Bis(9-bora-10-oxa-phenanthrenyl)-oxiden (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 536 (1986), S. 24-34 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Metal and Metalloid Compounds with Polyfunctional Molecules. XLI. Synthesis of 9-Bora-10-oxa-phenanthrenes, Bis(2′-oxy-terphenylyl)halogenoboranes, and Bis(9-bora-10-oxa-phenanthrenyl)oxidesThe reaction of 2′-hydroxy-m-terphenyl and 2-hydroxy-biphenyl resp. with n-C4H9Li and Na resp. and subsequent addition of trihalogenoboranes yields 9-halogeno-9-bora-10-oxa-phenanthrenes 1, 2, 5 and A besides 9-2′-oxy-m-terphenylyl-9-bora-10-oxa-phenanthrene 3 and bis-(9-bora-10-oxa-phenanthrenyl)oxides 4 and 6. Under somewhat different reaction conditions one obtains also the bis(2′-oxy-terphenylyl)halogenoboranes 7 and 8, tris(2-oxy-biphenylyl)-borane 9 and t-butyl-chloro-(2-oxy-biphenylyl)borane 10. 11 results from reaction of 2 with lithated hexamethyldisilazane. The compounds are characterized analytically and spectroscopically (1H, 11B-nmr spectra; mass spectra). For 4 and 6 X-ray analyses were performed.
    Notes: Die Reaktion von lithiiertem bzw. natriiertem 2′-Hydroxy-m-terphenyl bzw. 2-Hydroxy-biphenyl mit Trihalogenboranen ergibt neben den 9-Halogeno-9-bora-10-oxaphenanthrenen 1, 2, 5 und A, 9-2′-Oxy-m-terphenylyl-9-bora-10-oxa-phenanthren 3, die Bis(9-bora-10-oxa-phenanthrenyl)oxide 4 und 6. Durch etwas veränderte Reaktionsbedingungen sind auch die Bis(2′-oxy-terphenylyl)-halogenoborane 7 und 8, Tris(2-oxy-biphenylyl)boran 9 und t-Butyl-chloro-(2-oxy-biphenylyl)boran 10 erhältlich. 11 erhält man durch Reaktion von 2 mit lithiiertem Hexamethyldisilazan. Die Verbindungen werden analytisch und spektroskopisch (1H, 11B-NMR; MS) charakterisiert. Von 4 und 6 wurden Röntgenstrukturen angefertigt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865360504
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  • 8
    Electronic Resource
    Electronic Resource
    Assignment of proton and carbon NMR signals of didemnin A in solution (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 501-506 
    Details
    ISSN: 0749-1581
    Keywords: Cyclic depsipeptide ; Inverse COLOC ; Inverse HMQC ; Semi-selective excitation ; NMR assignments in peptides ; Didemnin ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several one- and two-dimensional techniques have been used to assign the 1H and 13C NMR spectra of the cyclic heptadepsipeptide didemnin A in DMSO. The composition and sequence of the amino acid residues was known beforehand and could be confirmed by heteronuclear proton-carbon long-range couplings using the COLOC experiment and a recently proposed new inverse technique using Gaussian-shaped pulses. The aliphatic methyl resonances of the isostatin, hydroxyisovalerylpropionyl, N-methylleucine and leucine residues were assigned by means of the TOCSY and NOESY techniques. Aliphatic carbon assignment was performed by inverse correlation via heteronuclear double quantum coherence.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260260613
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  • 9
    Electronic Resource
    Electronic Resource
    Darstellung und Molekülstruktur von 1,3-Diaza-2,4-disilacyclobutanen (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 482 (1981), S. 88-94 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Molecular Structures of 1,3-Diaza-2,4-disilacyclobutanesLithio-aminofluorosilanes are obtained from the reaction of aminofluorosilanes with butyllithium. The thermal elimination of LiF from lithio-aminofluorosilanes affords a simple synthetic route to four-membered silicon-nitrogen rings. The structures of 1,3-bis(3,5-dimethylphenyl)-2,2,4,4-tetramethyl- and 2,4-di-tert-butyl-2,4-difluoro-1,3-bis(2,4,6-trimethylphenyl)-1,3-diaza-2,4-disilacyclobutanes have been determined by X-ray diffraction.
    Notes: Lithio-aminofluorsilane werden in der Reaktion von Aminofluorsilanen mit Butyllithium erhalten. Die thermische LiF-Abspaltung aus Lithio-aminofluorsilanen ist ein einfacher Syntheseweg für viergliedrige Silicium-Stickstoff-Ringe. Röntgenstrukturuntersuchungen wurden von 1,3-Bis(3,5-dimethylphenyl)-2,2,4,4-tetramethyl-1,3-diaza-2,4-disilacyclobutan und von 2,4-Di-tert.-butyl-2,4-difluor-1,3-bis(2,4,6-trimethylphenyl)-1,3-diaza-2,4-disiacyclobutan durchgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814821110
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  • 10
    Electronic Resource
    Electronic Resource
    Funktionelle Siloxane und Cyclotetrasiloxane - Kristallstruktur eines CycloboratrisiloxansProfessor Gerhard Fritz zum 65. Geburtstage am 14. Dezember 1984 gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 519 (1984), S. 87-95 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Functional Siloxanes and Cyclotetrasiloxanes - Molecular Structure of a CycloboratrisiloxaneLithium salts of di-tert-butyl-fluorosilanol and -silandiol react with fluorosilanes to give 1,3-di- (1, 2), 1,3,5-tri- (3, 4), and 1,3,5,7,9-pentasiloxanes (5). Reactions of the dilithium salt of the silandiol with SiF4 and CH3SiF3 lead to the formation of fluorofunctional cyclo-1,3,5,7-tetrasiloxanes (6, 7). The cyclotetra-siloxane 8 is obtained by thermal LiF elimination from 1,1-difluoro-1,3-disiloxane-3-ol (2). The eight-membered ring systems 9 and 10 are formed in the reaction of dilithiated 1,3,5-trisiloxane-1,5-diol with SiF4 (9) and BF3 (10). The crystal structure of the cyclo-1-bora-3,5,7-trisiloxane 10 is reported and discussed.
    Notes: Lithiumsalze des Di-tert-butylfluorsilanols und -silandiols reagieren mit Fluorsilanen zu fluorfunktionellen 1,3-Di- (1, 2), 1,3,5-Tri- (3, 4) und 1,3,5,7,9-Pentasiloxanen (5). Der Einsatz des Dilithiumsalzes des Silandiols führt in der Reaktion mit SiF4 und CH3SiF3 zur Bildung fluorfunktioneller Cyclo-1,3,5,7-tetrasiloxane (6, 7). Das Cyclotetrasiloxan 8 wird durch thermische LiF-Abspaltung aus 1,1-Difluor-1,3-disiloxan-3-ol (2) erhalten. Die achtgliedrigen Ring-systeme 9 und 10 entstehen in der Reaktion des dilithiierten 1,3,5-Trisiloxan-1,5-diols mit SiF4 (9) und BF3 (10). Die Kristallstruktur des Cyclo-1-bora-3,5,7-trisiloxans 10 wird vorgestellt und diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845191209
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